Woofer 200003: masonite ring measures need

[Giorgio AR]

I want to find the AR drawings of the masonite ring of the 200003 woofer, I can't find them in the "library" and I don't even understand how to look for other technical drawings: I therefore need help to find something else ...
Can anyone kindly help me in the steps to consult this valuable data source !!
Thanks

Giorgio

[dxho]

Here's an index to the drawings:
http://www.aphenos.net/electronics/speakers/klh/AR_Drawings_.html,
with a link on the left to click for each.

There are several drawings of the 200003, but none that give measurements
of the masonite ring.

Measuring my own, looks like about 278mm OD, 252mm ID, 3mm thick
10.94" x 9.92" x .12"

[Giorgio AR]

14 hours ago, dxho said:

Here's an index to the drawings:
http://www.aphenos.net/electronics/speakers/klh/AR_Drawings_.html,
with a link on the left to click for each.

There are several drawings of the 200003, but none that give measurements
of the masonite ring.

Measuring my own, looks like about 278mm OD, 252mm ID, 3mm thick
10.94" x 9.92" x .12"

Thank you very much! I can't consult and find what I need correctly, thank you also for your measurements! I have in tot. 5 pairs between 200003 and 200003-1, I have all replaced the foam but never measured the masonite ring; the measurement with the foam is difficult and imprecise.
Happy listening,

Giorgio.

[fedeleluigi]

On 12/7/2021 at 9:06 AM, Giorgio AR said:

I want to find the AR drawings of the masonite ring of the 200003 woofer,

Here's the AR drawing of the masonite ring for the 200003 woofer manufactured after April 1977 (probably a few months later). 

With the introduction of the AR-10 Pi  MKII and AR-11 MkII  the 200003 woofer had some changes and also the masonite ring. In any case its inner diameter (9.80 in = 248,9 mm) and thickness (1/8 in = 3.175 mm) did not change.

 

[giovanni56]

2 ore fa, fedeleluigi ha detto:

Ecco il disegno AR dell'anello in masonite per il woofer 200003 prodotto fino all'aprile 1977. 

Con l'introduzione dell'AR-10 Pi MKII e dell'AR-11 MkII il woofer 200003 ha subito alcune modifiche e anche l'anello in masonite. In ogni caso il suo diametro interno (9,80 in = 248,9 mm) e lo spessore (1/8 in = 31,75 mm) non sono cambiati.

 

Thanks, guys, I have to build a pair of them on some bad woofers and I just needed the measures, however I noticed that on the 200003-1 the masonite ring has a width of the circular crown that is the largest diameter smaller in the first 200003 up to those with the black basket, then slightly reduced in the 200003 versions Ar10p with white logo on black up to about Ar9. I have made now a measure of the external diameter of the masonite ring on a woofer 200003 with black basket and it is 280mm so the 263mm indicated in the Ar drawing does not convince me, maybe the drawing refers to the masonite ring of the 200003-1.

[Giorgio AR]

8 hours ago, fedeleluigi said:

Here's the AR drawing of the masonite ring for the 200003 woofer manufactured until April 1977. 

 

Thanks Luigi !! I have already received help from dxho, useful for the quantity of drawings contained in the link indicated, but as per his statement what I was asking was missing ... you have solved it.
Didn't need it to me, but for a friend with 4 woofers 200003 without the AR90 pair rings.
Very, very pleased with your intervention and help.
Bentornato ( welcome back) Giorgio.

[giovanni56]

Sul disegno Ar è indicato un diametro di 263 mm, ma 248,9 + 31,75 = 280,65 che è la misura che ho trovato.

[fedeleluigi]

On 12/9/2021 at 3:52 PM, giovanni56 said:

I have made now a measure of the external diameter of the masonite ring on a woofer 200003 with black basket and it is 280mm so the 263mm indicated in the Ar drawing does not convince me, maybe the drawing refers to the masonite ring of the 200003-1.

The measurements of AR drawing I posted refer to the masonite ring for the 200003 woofers produced after April 1977, i.e. those used in the AR-10 Pi MKII and AR-11 MKII. Anyway you can see the previous measurement of the Outer Diameter (O.D.) in the "Revisions" of that drawing. See Revision E where they say that the O.D. was 11" i.e. 279,4 mm which is a similar measurement to the one you took. Unfortunately the inner diameter of the masonite ring for the previous older woofers is not reported in the revisions.

[fedeleluigi]

On 12/9/2021 at 1:18 PM, fedeleluigi said:

In any case its inner diameter (9.80 in = 248,9 mm)... did not change.

The above statement that I posted is incorrect.

I found a file of mine with the measurements of the masonite ring detected during some of my repairs. Here is a table with the measurements I found. The inner diameter I measured did change over the years. Obviously I did not measure 1,000 woofers to make statistics but I do think that the inner diameter changed after April 1977.

I specify that as regards the measurement of the thickness of the masonite ring, 3 mm refer to the measure in mm shown in the AR drawing I posted some days ago (see above).  Actually 1/8 in (shown in the AR drawing) are 3.175 mm and not 3 mm as shown in the same drawing, but I doubt 0.175 mm would change anything. 

[Giorgio AR]

27 minutes ago, fedeleluigi said:

file of mine with the measurements of the masonite ring

Great scheme to help us Acoustic Research enthusiasts, downloaded, printed and stored in my documentation, thanks

fedeleluigi.